[bug #52335] src: Some warnings from the compiler that need fixing or explanations in the code

[G. Branden Robinson]

Update of bug #52335 (project groff):

                Category:                    None => Core                   
              Item Group:                    None => Build/Installation     
         Planned Release:                    None => 1.22.4                 

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Follow-up Comment #7:


commit c0d8b9e264bc2657fbf78f1c7855fc1be534b265
Author: G. Branden Robinson <address@hidden>
Date:   Wed Nov 15 22:02:08 2017 -0500

    * src/libs/libgroff/new.cpp: Fix compiler warning.
    
    Define sized version of overloaded delete operator.  Duplicate code from
    unsized delete operator because simply calling through to it provokes
    another warning, -Wdelete-incomplete.

commit 001e6c139f2ecc6ea8a0476fbbf4fdf5be8f301c
Author: G. Branden Robinson <address@hidden>
Date:   Sun Nov 12 10:14:35 2017 -0500

    src: Document intentional case fallthrough.
    
    Per discussion with Bjarni Ingi Gislason, this should resolve compiler
    warnings from GCC 7 with -Wimplicit-fallthrough.  He had to do the
    testing for me since I'm still on GCC 6.3 (which doesn't emit these
    warnings at all).


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